Just buy a IRONFACE dewalt battery adapter kit(Second Edition) from Amazon, then mount it. pretty easy.
It does give the car a lot of speed with 20v power,and it controls the speed of the car,It also prevents the battery from over discharge,16v cut-off.
But it really have some problem,because the 20V voltage is higher than the 12V voltage required by the car, it may cause damage to the control board in the car, so it depends on the quality of your car.
